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Choppy Playback? How Much Muscle?

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Jona TaylorChoppy Playback? How Much Muscle?
by on Dec 22, 2012 at 11:29:29 am

Hello Folks,

Hoping some can weigh in here...

So after converting all the H264 footage to Prores the image plays back choppy. No effects.
Timeline is set to the footage. Safe RT, High, Full.
Is my Mac to slow for this material? One would think it would fly.
I've checked the forums... nothing concrete.

SATA 5 Bay (Firmtek) - Express Slot.

Hardware Overview:

Model Name: MacBook Pro
Model Identifier: MacBookPro4,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.6 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 6 MB
Memory: 4 GB
Bus Speed: 800 MHz

NVIDIA GeForce 8600M GT:

Chipset Model: GeForce 8600M GT
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 512 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x0407
Revision ID: 0x00a1
ROM Revision: 3212
Displays:
Color LCD:
Resolution: 1920 x 1200
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Built-In: Yes
DELL U2711:
Resolution: 2560 x 1440 @ 60 Hz
Pixel Depth: 32-Bit Color (ARGB8888)
Display Serial Number: D971T2721GCL
Mirror: Off
Online: Yes
Rotation: Supported

Huge thanks!

Jona


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Jerry HofmannRe: Choppy Playback? How Much Muscle?
by on Dec 22, 2012 at 1:31:13 pm

Try setting the playback to unlimited.

Jerry

Apple Certified Trainer, Producer, Writer, Director Editor, Gun for Hire and other things. I ski. My Blog: http://blogs.creativecow.net/Jerry-Hofmann

Current DVD:
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8-Core 3.0 Intel Mac Pro, Dual 2 gig G5, AJA Kona SD, AJA Kona 2, Huge Systems Array UL3D, AJA Io HD, 17" MBP, Matrox MXO2 with MAX - Cinema Displays I have a 22" that I paid 4k for still working. G4 with Kona SD card, and SCSI card.


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Jona TaylorRe: Choppy Playback? How Much Muscle?
by on Dec 24, 2012 at 4:58:17 am

Hi Jerry,

Than you for jumping in here.

I've tried both settings and it doesn't sem to make a difference.

As Neil mentions, I'm thinking the problem is coming form the slower GPU and the external monitor. Hard to believe that the 2008 Macbook can't power this external monitor and playback smoothly. Is that really asking for too much in 2008?

Best,
Jona


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Neil PatienceRe: Choppy Playback? How Much Muscle?
by on Dec 22, 2012 at 10:30:27 pm

Hi Jona

your machine should be fine, running the media from a SATA external drive should also be fine. What "flavour" ProRes are you trying to use ?
Certainly LT, 442 and even HQ should be OK as long as you are not trying to playback a 9 camera multicam sequence. ProRes 4444 might cause you some issues but unless your source is RED, Alexa etc etc or you need the embedded alpha channel you dont need 4444 anyway. Unlimited RT might help.
Have you tried disconnecting the 2nd monitor ? I have heard of instances where that slows things down on the older GPUs which might affect playback.
But otherwise your machine should handle things without too much complaint.

best wishes
Neil
http://www.patience.tv


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Jona TaylorRe: Choppy Playback? How Much Muscle?
by on Dec 24, 2012 at 4:53:59 am

Hi Neil! Thanks for the reply :)

The material is standard Prores 442.

Sadly, I think you are right about the problem being due to the external monitor which is a real drag because I bought this expensive monitor (Dell 2711) make editing easier and I was really looking forward to using it.

I should mention that the Macbook Pro plays the other material (XDCam 4:2:0) material back without any issues. Is this because it is a lower bit rate than the Prores 442 material and therefore has less drain on the GPU?

Does you (or anyone else) know of a way to overcome this 'slow GPU' without having to go out and buy another Mac?

Thanks again Neil,
Jona


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Jerry HofmannRe: Choppy Playback? How Much Muscle?
by on Dec 24, 2012 at 1:12:31 pm

Try lowering the playback quality and leave it on unlimited.

Jerry

Apple Certified Trainer, Producer, Writer, Director Editor, Gun for Hire and other things. I ski. My Blog: http://blogs.creativecow.net/Jerry-Hofmann

Current DVD:
http://store.creativecow.net/p/81/jerry_hofmanns_final_cut_system_setup

8-Core 3.0 Intel Mac Pro, Dual 2 gig G5, AJA Kona SD, AJA Kona 2, Huge Systems Array UL3D, AJA Io HD, 17" MBP, Matrox MXO2 with MAX - Cinema Displays I have a 22" that I paid 4k for still working. G4 with Kona SD card, and SCSI card.


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Jona TaylorRe: Choppy Playback? How Much Muscle?
by on Dec 24, 2012 at 8:25:57 pm

Hi Jerry, (and David)

I think you guys nailed it.
Now set to Unlimited RT, Playback Video Quality: Dynamic.
No choppy playback issues.

Big thanks to both of you! I really appreciate this forum :)
Jona


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David EaksRe: Choppy Playback? How Much Muscle?
by on Dec 24, 2012 at 4:11:48 pm

When you place a new clip onto the timeline, it does not need to be rendered, correct? If it does, your settings don't actually match perfectly.

As well as setting unlimited RT, quality dynamic, and frame rate full, a nice trick is to open the quickview window. You can adjust effects during playback in realtime.


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